JP2008045785A - Condensate collecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensate collecting device free from steam loss, that is, heat energy loss. <P>SOLUTION: A high-pressure condensate pipe 14 is connected to a condensate storing container 11. A steam ejector 2 is connected to an upper part of the condensate storing container 11, and a condensate collecting pump 4 is connected to its lower part. A low-pressure condensate supply pipe 15 is connected to a condensate inflow port 23 of a condensate pressure-feeding member 5. A high-pressure operational fluid discharge port 26 of the condensate pressure-feed member 5 and a suction portion of the upper steam ejector 3 are connected by a pipe conduit 10. High-pressure condensate is supplied from the high-pressure condensate pipe 14 into a condensate storing container 11, partially re-evaporated to be steam in the container 11 and sucked by the steam ejector 2, and the remaining condensate is returned to a condensate returning destination by the condensate collecting pump 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

 The present invention relates to a condensate recovery apparatus that recovers condensate as condensate of steam generated in a steam-using device to a condensate recovery destination such as a boiler.

 A conventional condensate recovery device is composed of a steam trap and a condensate inflow pipe provided on the secondary side or outlet side of the steam-using equipment, a control valve attached to the pressure relief pipe, and a condensate pump attached to the condensate outflow pipe. The control valve attached to the pressure relief pipe is configured to discharge part of the re-evaporated steam of the condensate discharged from the steam trap to the outside of the system. The water pump can recover the high-temperature condensate to a predetermined location.

The conventional condensate recovery apparatus has a problem that steam loss, that is, heat energy loss occurs, because part of the reevaporated steam is discharged out of the system from the pressure relief pipe and the control valve.
Japanese Patent Publication No. 60-42846

  The problem to be solved is to obtain a condensate recovery apparatus that does not cause steam loss, that is, thermal energy loss.

  The present invention recovers condensate generated in steam-using equipment to a condensate recovery destination such as a boiler or a water supply tank using a condensate recovery pump, and connects the condensate supply pipe to a condensate reservoir and A steam ejector and a condensate recovery pump are connected to a water reservoir, a condensate supply pipe is connected to a condensate pressure feeding member, and a steam ejector is connected to the condensate pressure feeding member.

  In the present invention, the steam ejector is disposed in the condensate reservoir and the condensate pressure-feeding member, so that the re-evaporated vapor, in which a part of the condensate is evaporated again in the condensate reservoir and the condensate-pressure feeding member, is obtained by the steam ejector. By sucking and supplying to a predetermined steam utilization location, no steam loss, that is, thermal energy loss occurs.

  Although the present invention uses a steam ejector, the steam ejector uses steam at a predetermined pressure as a driving fluid. When a small amount of re-evaporated steam is sucked, a steam having a relatively low pressure is used as a driving fluid. On the other hand, when a large amount of re-evaporated vapor is sucked, high-pressure vapor can be used as the driving fluid.

  In FIG. 1, two steam ejectors 2 and 3 connected to a steam supply pipe 1, a condensate recovery pump 4, and a condensate pumping member 5 constitute a condensate recovery device.

The right side portion of the steam supply pipe 1 is connected to a boiler (not shown) as a steam supply source to connect the steam ejector 2 and the second steam exhaust sector 3 is connected to the branch pipe 6 branched in the middle. The outlet sides of the respective steam ejectors 2 and 3 are further combined into a single steam supply pipe 13 and connected to a steam utilization location (not shown). Further, pressure adjusting valves 7 and 8 for adjusting the supplied steam pressure are attached to the inlet side of the steam ejectors 2 and 3.

The suction portions of the respective steam ejectors 2 and 3 are connected to the condensate reservoir 11 and the condensate pressure-feeding member 5 by pipes 9 and 10. The condensate reservoir 11 is a hermetically sealed container that temporarily stores the high-pressure and high-temperature condensate flowing down from the high-pressure condensate supply pipe 14, and the high-temperature condensate is re-evaporated into steam again in this container. It is sucked into the suction part of the steam ejector 2 via. Similarly, a low-pressure condensate supply pipe 15 is connected to the condensate pumping member 5, and re-evaporated steam of low-temperature condensate is generated in the condensate pumping member 5 and sucked into the suction portion of the steam ejector 3.

A condensate recovery pump 4 is connected to the lower part of the condensate reservoir 11 via a pipe line 16. The condensate recovery pump 4 has a circulation pump 17 and an ejector 18 connected by a circulation path 19, and a part of the circulation path 19 is branched to connect a condensate recovery pipe 20. A primary pressure regulating valve 21 is interposed in the condensate recovery pipe 20 so that the upper right end communicates with a condensate recovery destination such as a boiler or a water supply tank (not shown).

By driving the circulation pump 17 and circulating a predetermined amount of condensate in the circulation path 19, the condensate in the condensate reservoir 11 is sucked by the ejector 18 and the condensate is recovered from the condensate recovery pipe 20. To do.

The condensate pumping member 5 has a condensate inlet 23, a condensate outlet 24, a high-pressure operating fluid inlet 25 and a high-pressure operating fluid outlet 26, and a low-pressure condensate 5 is connected to the condensate inlet 23 via a check valve 27. A water supply pipe 15 is connected.

The check valve 27 allows the condensate to flow from the low-pressure condensate supply pipe 15 into the condensate pumping member 5 and prevents the reverse condensate flow. Similarly, a condensate pressure feeding pipe 29 is connected to the condensate outlet 24 via a check valve 28. The check valve 28 has a function of allowing the flow of condensate from the condensate pressure-feeding member 5 to the condensate pressure-feeding pipe 29 and blocking the opposite flow. The upper end of the condensate pressure-feed pipe 29 is connected to the inlet of the high-pressure condensate supply pipe 14 of the condensate reservoir 11 so that the condensate of the condensate pressure-feed member 5 is supplied into the condensate reservoir 11. Like that.

A high pressure steam pipe 30 is connected to the high pressure operation fluid inlet 25 of the condensate pressure feeding member 5. On the other hand, the high-pressure operating fluid discharge port 26 communicates with the suction portion of the steam ejector 3 through the conduit 10.

The condensate pumping member 5 closes the high-pressure operating fluid introduction port 25 and opens the high-pressure operating fluid discharge port 26 when a float (not shown) disposed therein is located at the lower portion, and supplies the low-pressure condensate supply. Condensate is allowed to flow from the pipe 15 through the check valve 27 and the condensate inlet 23 into the condensate pressure-feeding member 5, and re-evaporated steam in which part of the condensate has evaporated again in the condensate-pressure feed member 5 is The steam ejector 3 sucks through 10.

When condensate accumulates in the condensate pumping member 5 and a float (not shown) is positioned at a predetermined upper portion, the high-pressure operation fluid discharge port 26 is closed, while the high-pressure operation fluid introduction port 25 is opened and the high-pressure steam pipe 30 is opened. Then, the condensate accumulated inside is pumped into the condensate reservoir 11 through the condensate outlet 24, the check valve 28 and the condensate pressure feed pipe 29 by flowing the high pressure pumping steam into the inside.

  When the condensate is pumped and the liquid level in the condensate pumping member 5 is lowered, the high pressure operating fluid inlet 25 is closed again and the high pressure operating fluid outlet 26 is opened, so that the condensate is discharged from the condensate inlet 23. Flow down to the inside. By repeating such an operation cycle, the condensate pressure feeding member 5 pressure-feeds the condensate from the low-pressure condensate supply pipe 15 to the condensate reservoir 11.

  The high-pressure condensate supplied from the high-pressure condensate supply pipe 14 into the condensate reservoir 11 is partially re-evaporated in the container 11 to be re-evaporated and sucked into the steam ejector 2 and re-evaporated. The condensate that has not been drawn is sucked into the condensate recovery pump 4 through the pipe line 16.

  Similarly, the low-pressure condensate supplied from the low-pressure condensate supply pipe 15 into the condensate pumping member 5 partially evaporates again in the condensate pumping member 5 to be re-vaporized and sucked into the steam ejector 3. The low-pressure condensate that has not re-evaporated is pumped into the condensate reservoir 11 by the condensate pumping member 5.

  In this way, by sucking the re-evaporated vapor with the steam ejectors 2 and 3 and supplying the re-evaporated vapor to the location where the vapor is used, there is no re-evaporated vapor released into the atmosphere, and vapor loss, that is, thermal energy loss can be eliminated. .

The block diagram which shows the Example of the condensate collection | recovery apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steam supply pipe 2 Steam ejector 3 Steam ejector 4 Condensate recovery pump 5 Liquid pumping member 11 Condensate reservoir 14 High pressure condensate supply pipe 15 Low pressure condensate supply pipe 17 Circulation pump 18 Ejector 20 Condensate recovery pipe 23 Condensate inlet 24 Condensate outlet 25 High-pressure operating fluid inlet 26 High-pressure operating fluid outlet 29 Condensate feed pipe 30 High-pressure steam pipe

Claims (1)

Condensate generated in steam-using equipment is collected by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank, and the condensate supply pipe is connected to the condensate reservoir and the condensate reservoir A condensate recovery apparatus, wherein a steam ejector and a condensate recovery pump are connected, a condensate supply pipe is connected to a condensate pumping member, and a steam ejector is connected to the condensate pumping member.

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